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Buckling analysis (SOL105) with multiple load cases

n.zedde
Setting aside the argumentation of whether it is meaningful at all to run a linear buckling analysis for multiple load cases, how to correctly model it?
 
In the case of a buckling analysis with only one subcase the analysis run without any issue. However, in the case of multiple subcases with different loads and same SPCs defined at scenario level, the error message:
 
*** USER FATAL MESSAGE 9025 (SUBDMAP PHASE0)
   THERE IS NO STATIC SUBCASE FOR BUCKLING ANALYSIS.
   USER ACTION: ADD STATIC SUBCASE(S).
 
Is it correct that for each buckling subcase a static subcase should be defined making effectively the number of subcases double?
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    The case control section for multi subcases in SOL 105 looks like:

    SOL 105
    $ Direct Text Input for Executive Control
    CEND
    TITLE = MSC.Nastran job created on 10-Nov-06 at 14:24:06
    ECHO = NONE
    $ Direct Text Input for Global Case Control Data
    SUBCASE 1
    TITLE=This is a default subcase.
    SPC = 2
    LOAD = 2
    DISPLACEMENT(SORT1,REAL)=ALL
    SUBCASE 2
    TITLE=This is a default subcase.
    SPC = 3
    LOAD = 3
    DISPLACEMENT(SORT1,REAL)=ALL
    SUBCASE 3
    TITLE=This is a default subcase.
    SPC = 2
    METHOD = 1
    VECTOR(SORT1,REAL)=ALL
    STATSUB=1
    SUBCASE 4
    TITLE=This is a default subcase.
    SPC = 3
    METHOD = 1
    VECTOR(SORT1,REAL)=ALL
    STATSUB=2
    $ Direct Text Input for this Subcase
    BEGIN BULK

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  • 0

    The case control section for multi subcases in SOL 105 looks like:

    SOL 105
    $ Direct Text Input for Executive Control
    CEND
    TITLE = MSC.Nastran job created on 10-Nov-06 at 14:24:06
    ECHO = NONE
    $ Direct Text Input for Global Case Control Data
    SUBCASE 1
    TITLE=This is a default subcase.
    SPC = 2
    LOAD = 2
    DISPLACEMENT(SORT1,REAL)=ALL
    SUBCASE 2
    TITLE=This is a default subcase.
    SPC = 3
    LOAD = 3
    DISPLACEMENT(SORT1,REAL)=ALL
    SUBCASE 3
    TITLE=This is a default subcase.
    SPC = 2
    METHOD = 1
    VECTOR(SORT1,REAL)=ALL
    STATSUB=1
    SUBCASE 4
    TITLE=This is a default subcase.
    SPC = 3
    METHOD = 1
    VECTOR(SORT1,REAL)=ALL
    STATSUB=2
    $ Direct Text Input for this Subcase
    BEGIN BULK

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